Does anyone have any experience with using the identified piston w/4.25 stroke, 7.100 rod and the 240's. Just looking for experience with this piston and the subject heads and/or any other similar pistons to achieve 10.5 to 11 to 1 compression. Realize other options at 4.15 but wanting to stick 4.25.

Thanks in advance.

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

Thanks for the reply, should have been more specific on question. Assume you were happy with quench distance and performance accordingly?

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

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.