Posted By: B3422W5
School me on the RHS smallblock head - 10/07/11 09:01 PM
Potential, cost, porting options, etc.
PS..
I have already read the info from the RHS site about these, just want more real world info, porting cost/benefits, valve size upgrade needed, how big of lift cam can be used, etc, etc.....
Posted By: MIKES_DUSTER
Re: School me on the RHS smallblock head - 10/07/11 09:14 PM
Brian from IMM is THE place to buy them from!!!!! I think he sells them for under $1400 all ready to go.
Posted By: cudadoug
Re: School me on the RHS smallblock head - 10/08/11 01:10 AM
Yep, what they said...call Brian. Depending on your goals, these are GREAT heads. If you're looking for 750 HP? No. But they can support in excess of 600 easy. The best part is the cost...
My REAL WORLD experience was a pair bought from NOT Brian in the LA versions with a 2.02 intake, Comp 26995 Beehive springs, ret, locks ready to run. We took them apart and chucked on a known bench to see the flow #'s. The number's really don't matter as your actual mileage (and flow #'s) will vary. But I will tell you that with a GOOD VJ added, a little (very little) blending of the guide boss and unshrouding of the chamber, they improved about 10 cfm to 268 @ .600", the same at .650" and going backwards above that. We called it a success and plopped them on a motor for the Duster and here are the specifics:
*416
*12.2:1 Flat top (KB Forged)
*SCAT I beams
*Eagle forged crank
*The aforementioned RHS heads
*Comp Stainless 1.5 rockers
*Custom Bullet solid (non-roller) cam (268/276 @ .050 w/.585 net lift)
*Old Victor intake (with a minimal plenium blend)
*REALLY Old 800 Holley (tuned it to 848 on our bench)
*2" open spacer (because that's what fits the air cleaner/carb/scoop/seal deal)
*Hooker 1 3/4 headers
*Dynomax 3" Bullet muffs
904 (standard low gear)
8" Converter (5200 real flash in good air)
4.56
29.5 tall slick
dead on 3100# race weight.
Cal Mono Springs/Cal tracs...
Best so far: 10.14 @ 128 (107 in the 1/8) with a 1.42 60' best. If I can just get that 60' to a solid 1.35...
Posted By: mshred
Re: School me on the RHS smallblock head - 10/08/11 02:10 PM
I can't tell you much other than that these heads flat out work, and Brian is the man to get them from
With these heads and a custom ground comp hydraulic roller on my stock junkyard bottom end 91 360 LA motor my 4 speed 3400lb street car runs 12.3-12.4 all day long on 87 pump puke! This motor is nothing fancy at all, in fact the heads and cam are what make it work so well...so I can just imagine the potential it would have on a bigger motor...which reminds me, if you want a cam to work with them, Brian will spec you out an awesome one!
good luck!
Posted By: OneRunSon
Re: School me on the RHS smallblock head - 10/08/11 10:13 PM
cudadoug, what's your shift point rpm's
very impressive combo
Posted By: B3422W5
Re: School me on the RHS smallblock head - 10/12/11 05:39 PM
great info, sure appreciate it.
Sure sounds like a cheap way to do what i want, mid-high 11's on pump gas without a stroked motor.
Just wonder in say a 3400 pound car, how a 360 with about 10 to 1 compression, maybe a 9.5 inch convertor and a set of those heads would run with a mildish cam if the combo was scienced out correctly.
Posted By: joedust451
Re: School me on the RHS smallblock head - 10/12/11 07:14 PM
I bought mine from hughes ready to bolt on in stock form, now the price at the time was 800.00, I ran 12.5s at 105 with a race weight of 3200+ lbs., this was with a junkyard 360 magnum shifting at 5100, just bolt-ons, 3.73 gears & an 11" 2800 stall, 650dp. These heads are still great in stock form, just depends on what your after.
Posted By: cudadoug
Re: School me on the RHS smallblock head - 10/12/11 07:46 PM
Don, I think your goal is very do-able! I'd source a 5.9 mag to run a custom ground hyd roller with OEM lifters, 2.02 RHS heads, air gap, 750 carb, 1 5/8 headers, 904, 9" or 10" converter...and there you go. Might take a 3.91-4.10 gear to get there. But it makes me ask: Why not a 4.00" crank combo?? Here is the logic behind my question:
Crank: Cast 4.00" crank can be had for what...$250-$300? What's it going to cost to mag, turn and polish an OEM crank?
Rods: SCAT I-beams (no block grinding) are $300. What's it cost to have OEM rods redone? Here in CA it's about $250-$275 done RIGHT with ARP hardware
Pistons: Yea, okay you can get $300 Hyper KB's but the Forged KB for the 4.00" crank are in the $470-$480 range.
My points are:
1) Nearly the same $$ to get a cast 4" crank vs. a OEM redo
2) Rods...ditto
3) Pistons are on a couple of hun more...
5) Balancing? You'd have to have the 360 balanced also, right??
For the additional 50+ ft lbs of torque, the few hun it takes to build a "street" 408 is a pretty good deal, IYAM (New one: If You Ask Me...LOL) You could be in the mid-high 11's with a 3.55 gear!
Posted By: RobX4406
Re: School me on the RHS smallblock head - 10/12/11 09:12 PM
Don,
Brian recently built a 360, stock crank/rods/KB107's, 2.02 RHS, Comp XE275HL hyd cam, Air Gap, 750 DP, headers.
Made right at 430hp and 440tq
Not a crazy build and capable of 11.60-11.80's in a well set up car, that I know you are more than capable of putting together.
There are a bunch of different flavors of these heads floating around out there. Make sure you pay attention to the parts that they come with, there is a big difference.
Posted By: CompWedgeEngines
Re: School me on the RHS smallblock head - 10/12/11 09:20 PM
" There are a bunch of different flavors of these heads floating around out there. Make sure you pay attention to the parts that they come with, there is a big difference. "
Exactly Rob..well said...not apples to apples often.
Posted By: RobX4406
Re: School me on the RHS smallblock head - 10/14/11 05:02 AM
I hear you on wanting something with a bit of lope to it. Should be plenty to get an 11.50 timeslip.
Posted By: 65signet
Re: School me on the RHS smallblock head - 10/14/11 09:05 PM
I see Hughes makes a 246/252 thats ground on a 106, with about the correct lift with a 1.6 rocker. With that tight of LSA it should sound choppy.
I have that same cam in my 360 with the 1.6 rockers my car is street- strip and i really like it so far.
Posted By: SB Dakota
Re: School me on the RHS smallblock head - 10/14/11 11:43 PM
Mike @ MRL Pref Got my heads for 1300
http://www.mrlperformance.com/