this is a pic of the pistons that are in the roller motor we got, is it a stock piston, notice it is all the way up even on deck on TDC, based on what you see and knowing we have 60cc Edelbrock heads anyone got a guess on CR? and motor has never been bored and is tight, no ring groove at all.
My guess is 9.54:1. I believe the stock pistons have a 4cc dish. Basing on stock 5.0 h.o. is a 9.0:1 with 4cc pistons and 64cc chambers (e7 heads).
thanks Thats great if we are pushing right at 10:1, since we are going to spray the motor I don'r want anymore than that
Great guess, Dan! -4cc of piston volume 60cc chambers .041 thick head gasket -0- deck 4" bore 3" stroke That makes it a 9.54:1 Using a .054 thick head gasket would drop it to 9.23:1 Pretty hard to have much effect with that short stroke. Here's the calculator I always use http://www.race-cars.net/calculators/compression_calculator.html SPark
Thickness I may be wrong but the compressed gasket that Edelbrock recommended is .024 when compressed.......I think thats what they said
According to Edelbrock, a low compression engine with 7/16 head bolts and without nitrous should use a FelPro 9333-PT1 which is .047 thick. Low compression is anything below 10:1 according to them. This is what you have. The next step up in compression (10-12:1) would be a 1011-2 gasket that is .039 thick. This is the gasket I would recommend to you. The last step is a FelPro 1006 which is a lock wire gasket. It requires a receiving wire grove be machined into the head and is for 1/2" head bolts. It, too, is .039 thick. This is the recommended by Edelbrock nitrous gasket setup. Unless you are spraying a lot, you probably don't need this but it is the safest bet with nitrous. No gasket recommended by Edelbrock is that thin. In fact, the Edelbrock 7313 gasket that they recommend for the first 2 situations above is .047 thick. SPark
Max It has jets to meter from 50, 75, 100, 125 and 150.......I'm sure we will start at 75 and see how it goes but will not exceed 150 at least not on this motor
I have run the 1011-2 gasket on 14:1 motors. I also use head studs. From all the engine questions you post, I think you should build a solid, basic motor and run it without spray for a while. You sound like you need to learn basic engine building, tuning and maintenance before adding something like nitrous to the mix. JMO, SPark
maybe It has been many years since I built any hot engines and I have never built a SBF, my first complete build was a 440 out of a Super Bee at age 12 (hands on with a 19 year old who taught me) I fully understand nitrous and have used it on a few different vehicles, the last being a 2004 5.4 mod motor in a F150, had the nozzle type that drill, tap and screwed right into the plenum, it was a 125 shot (talk about waking a truck up!) I ask alot of questions as I am not familiar with the 5.0, I'm doing this with my son and want to make sure we are doing it right and mounting a nitrous plate between the carb and intake is cheap and it's there if we need/want it. We have settled on exactely whats listed below and what we don't have is on order, did change to an X303 cam due to the comp we were going to run was going to require new valve springs due to the extreme lift and from what I gather from all the questions I ask on here and tech support at various places and friends who all have a slightly diff idea each, we think this little car should prove eventful
Fyi And I didn't intend for my reply to come off as miffed by your suggestion, quite the contrary, as I have mentioned before I am ADHD to the max and unfortunately ya'll get to have a headache from "oh hell, now he wants to do something else diff" lol. just you wait one day soon my, I mean my son's Maverick is gonna kick some butt round here
