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horsepower guesses? #111871 08/28/08 09:38 PM 08/28/08 09:38 PM
Joined: Sep 2003 Posts: 372 Ohio J jensenguy OP enthusiast
jensenguy OP enthusiast J Joined: Sep 2003 Posts: 372 Ohio	Im getting very close to firing up my engine, just curious as to what you think it'll do. 440 std bore essentially stock heads edelbrock performer 440 intake holley 3310 750cfm measured 9-1 compression lunati voodoo cam 226 / 234 @.050, .494 / .513lift log exh. manifolds (i tried to fit headers, just wouldnt happen) its in a 4000+lb car, 727 w/ shift kit and 2800 stall converter, 3.54-1 dana 44 w/ auburn limited slip

Re: horsepower guesses? [Re: jensenguy] #111872 08/28/08 10:07 PM 08/28/08 10:07 PM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit mopar
68Bullit mopar Joined: Mar 2008 Posts: 571 Western NC	I'll take a stab and say 415 hp.

Re: horsepower guesses? [Re: 68Bullit] #111873 08/28/08 11:12 PM 08/28/08 11:12 PM
Joined: Jan 2003 Posts: 1,374 Houston,Tx. L Lee446 pro stock
Lee446 pro stock L Joined: Jan 2003 Posts: 1,374 Houston,Tx.	Outside of the cam, for all intents and purposes you have a stock 440. The performer is basically identical to the stock iron intake. The 3310 offers little if anything over the 440 avs which was approximatley the same cfm. Compression is realistically about what the HP 440's were running, though they claimed 10-1. The log manifolds will hurt. The cam is a bit more than I would pick with this combo unless you are planning on some head porting and headers later. I would pick a Comp cams, either a 268 or 270 series with that heavy of a car. Is there any way you could run the HP exhaust manifolds? I assume you are running a c body? My guess would be, on a dyno, 350-375 horses.

Re: horsepower guesses? [Re: Lee446] #111874 08/29/08 07:21 AM 08/29/08 07:21 AM
Joined: Sep 2003 Posts: 372 Ohio J jensenguy OP enthusiast
jensenguy OP enthusiast J Joined: Sep 2003 Posts: 372 Ohio	Nope - i need the center dump of the manifolds i have to have a chance of leaving the engine compartment. This is in my 74 jensen interceptor - the weight is more of here-say, but it is a full frame car so id believe it.

Re: horsepower guesses? [Re: jensenguy] #111875 08/31/08 11:16 PM 08/31/08 11:16 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Block huggers are the only headers you will find that will fit without making a set yourself I bet.... Even some of the more compact headers won't fit on an Interceptor, the floor at the front is in the way. Hedman (I think) makes a header that looks close, but I have never tried them so I'm guessing they wouldn't fit if I had to guess..... I think alot of people think the Interceptors are over 4000 pounds, but I think even the MIII Interceptors are just shy of 4000 pounds..? An HONEST 9 to 1 compression is pretty good IMO. Any pics??!?! CrAzYMoPaRGuY

Re: horsepower guesses? [Re: Lee446] #111876 09/01/08 12:26 AM 09/01/08 12:26 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	You have a stock 440-hp minus the HP exhaust manifolds. That will hurt you. As-is with those lo-po exhausts, I'd say you're probably putting out around the same HP as a stock 440-HP, 375. I'd imagine headers would be worth a good hp increase, probably 20-25hp for sure, enough to get you to the 400 mark.

Re: horsepower guesses? [Re: DaytonaTurbo] #111877 09/01/08 12:43 AM 09/01/08 12:43 AM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Quote: You have a stock 440-hp minus the HP exhaust manifolds. That will hurt you. As-is with those lo-po exhausts, I'd say you're probably putting out around the same HP as a stock 440-HP, 375. I'd imagine headers would be worth a good hp increase, probably 20-25hp for sure, enough to get you to the 400 mark. I'm not sure if ALL Jensens were HP engines, but the one in my 1974 Jensen Interceptor is stamped HP. The manifolds are the center dump truck manifolds I'm pretty sure. Hey Jensenguy, have you ever seen these? http://cgi.ebay.com/ebaymotors/New-Hedma...sspagenameZWD1V CrAzYMoPaRGuY

Re: horsepower guesses? [Re: CrAzYMoPaRGuY] #111878 09/01/08 02:05 AM 09/01/08 02:05 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	I guess I should have said, he's built the equivalent of a 440-hp but with crappy manifolds and a bigger cam. Did not mean to mislead and say that's what he had originally.

Re: horsepower guesses? [Re: DaytonaTurbo] #111879 09/01/08 10:29 AM 09/01/08 10:29 AM
Joined: Sep 2003 Posts: 372 Ohio J jensenguy OP enthusiast
jensenguy OP enthusiast J Joined: Sep 2003 Posts: 372 Ohio	thanks guys! The motor from the factory was a low-comp engine i think i calculated 7.8-1. The plan was to step up my pistons, but the previous owner had apparently cut the heads down already, giving me 9 - 1 compression ratio. Not the best way to do that i know, but i had to work with what i had. I actually test - fitted a pair of headers that look like the above picture, might have even been the same ones. There was no way they would work. Because the only exit is straight down (and the exhaust pipe still has to make a sharp bend outwards to clear the frame rail.) More than likely after i get this thing running again, I'll will be keeping my eyes open for better manifold options. If I can find some pics of the car I will post them.

Re: horsepower guesses? [Re: jensenguy] #111880 06/18/09 09:38 PM 06/18/09 09:38 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	I had to drag this post up. LOL I ended up going with Delta Motorsport headers made specifically for an Interceptor. They fit like a glove, but the steering support bracket needs a modification that isn't too hard. I am going to try dual Edelbrock 500s. I went with a 270H Comp Cam, I have a measured 9.35 to 1 compression 446 (.030" over) and I ported my heads and did a bit of bowl work. I did quite a bit of weight savings with the intake, headers, removing the AC (I'll convert to a Sanden later) an aluminum waterpump housing, etc... Any pics of your engine bay?!?! CrAzYMoPaRGuY

Re: horsepower guesses? [Re: CrAzYMoPaRGuY] #111881 06/18/09 10:24 PM 06/18/09 10:24 PM
Joined: Sep 2003 Posts: 372 Ohio J jensenguy OP enthusiast
jensenguy OP enthusiast J Joined: Sep 2003 Posts: 372 Ohio	wow. It took me a while to figure out I actually posted this! The sad thing is thats pretty much around the last time Ive had a chance to do anything to the car until the last few days. And the engine bay is still definitely in no shape to be taking pictures of. I have seen those Delta Motorsport headers - I seem to recall they were expensive enough to turn me off to them. Good to know they fit well though. Have you driven the car with that setup yet? I'd be interested to know how it works out. I gotta say though, you gotta keep the jensen valve covers. Its just not right without them.

Re: horsepower guesses? [Re: jensenguy] #111882 06/18/09 11:10 PM 06/18/09 11:10 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Quote: wow. It took me a while to figure out I actually posted this! The sad thing is thats pretty much around the last time Ive had a chance to do anything to the car until the last few days. And the engine bay is still definitely in no shape to be taking pictures of. I have seen those Delta Motorsport headers - I seem to recall they were expensive enough to turn me off to them. Good to know they fit well though. Have you driven the car with that setup yet? I'd be interested to know how it works out. I gotta say though, you gotta keep the jensen valve covers. Its just not right without them. I haven't driven the car modified yet, I've only driven it stock (ish) and embarrassingly sedately. Good thing as my motor mounts were pretty well non-existant! I'm keeping my Jensen covers, but mine were really rough castings and need a fair amount of work to make them look decent. In time! Any pics of your car??!?! CrAzYMoPaRGuY

Re: horsepower guesses? [Re: jensenguy] #111883 06/18/09 11:13 PM 06/18/09 11:13 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Quote: I have seen those Delta Motorsport headers - I seem to recall they were expensive enough to turn me off to them. Good to know they fit well though. I bought mine in a pile of parts, I think there are much better Interceptor headers available in the UK if my memory isn't tricking me. The DMS headers are basically just a block hugger header that doesn't really hug the block! They fit well, but I'm not sure how good they are for maximum performance. CrAzYMoPaRGuY

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