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Re: TF 240 or 270s - 440 Source 5070 Piston Question
[Re: BryanRad]
#3083302
10/04/22 04:47 PM
10/04/22 04:47 PM
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Joined: Mar 2009
Posts: 2,467 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,467
Sydney,Australia
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I have the Source 4.25 , 7.1 rod combo with 270s . At pretty much zero deck and a cometic 0.040 gasket I am right around 11:1 . Cant say for sure which actual piston , I looked at their range and chose for 11ish comp
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: TF 240 or 270s - 440 Source 5070 Piston Question
[Re: BryanRad]
#3083365
10/04/22 07:36 PM
10/04/22 07:36 PM
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Joined: Mar 2009
Posts: 2,467 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,467
Sydney,Australia
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I used the gasket to get 0.040 approximate quench . I run premium pump gas no problems at all . Performance - yes very happy with it . For a regular street car with sft cam .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: TF 240 or 270s - 440 Source 5070 Piston Question
[Re: tex013]
#3083431
10/04/22 11:55 PM
10/04/22 11:55 PM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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I have run these pistons in an rb with trickflow 240’s and 6bbl. Engine runs very well…dynoed just under 600 hp and 630lb ft tq. That was with a holley street dominator single plane. With factory iron 6bbl intake and carbs: 574 hp and 608 lb ft tq.
That is with a .027” commetic gasket in at 10.95:1
With a comp hyd roller cam , .589 int / .571 ex lift , dur @.050” is 235 int/ 241 ex., i ended up with .211” intake and .236” exhaust piston to valve clearance. Cam installed at 108 int c/l. 112 lsa
All in all, combination works well together with the trickflows. Never ran the TF270s but i see they run hard.
Last edited by Chargerfan68; 10/04/22 11:58 PM.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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