Cranking Compression
If you've got those pistons in there and there was no excessive milling on the block or heads, it's closer to 8.0:1 static compression. They are short (end up .110" down in the hole if your block is "only" 9.60 deck height) and they have a 14cc dish in them. In order to get 9.5:1 static, you'd have to have milled the block over .100", or cut the heads down a ton AND milled the block a bit. The problem is the pistons IMO. If it were me I'd be looking to go down a couple steps to the XE274H. 160 psi is ok for an iron open chamber head, but not great. And truthfully, it's low for an aluminum head combo.
Federal Mogul/Speed Pro Piston Part
Number
Application Power Range Special requirements Compression information
Ring groove size
Pin diamater
Rod length
Stroke
Deck clearance
Skirt clearance
H405CP plus Perfect Circle/Hastings moly rings (2M139)
At time of listing, STD, +.030, and +.040 are available. Please contact us to inquire about other sizes.
Chrysler 360 (4.000" STD bore) 1971-95 flat top with 4 valve reliefs
idle to 6000+rpm Good for street/strip or light race 1.637 compression distance
Compressions:
w/63cc heads 9.11:1
w/65cc heads 8.94:1
w/68.4cc heads 8.66:1
5/64" 5/64" 3/16" ring grooves
.9842" pin diam.
6.123" (stock length) rods
3.578" stroke
PRESS ONLY
.050" deck clr
.0015" skirt clr
w/63cc heads 9.11:1. I'm using the thin head gasket. I may have exaggerated the compression gain of the head gasket a little :-D.
The bottom end was put together by a local shop roughly 8 years ago. 4 years ago I moved to the same town as Victory Engines. After watching a couple small block strokers pull 500+ HP on the dyno. I wanted to build one of my own (but there was nothing wrong with my bottom end) Talking with Matt I decided to go with some ede heads and lose the DEH275 comp cam for a XE284. The parts would work great with the later stroker build that I had planned and still pick up some HP.
I am basically trying to add power to a crap bottom end.
"The problem is the pistons IMO" The pistons are the problem. What would the cost ($/labor) be to just put better pistons in. I have asked this question numerous times. Not sure what the word is for it but whenever I start talking about it. The mine as wells, and if I buy this I should get this, etc. I always end up with a fire breathing stroker.
At work today the idea came up to buy a boneyard 360. Do a little work to the heads and bolt them on with the DEH275 cam. Drop the bone yard block off at Victory. Become a hooker to buy the stroker kit. Sell the old long block to pay for gas and tires. :burnout: