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Re: Your Piston Specs - B1 head valve reliefs [Re: 440Jim] #2893097
02/25/21 04:42 PM
02/25/21 04:42 PM
Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
WadeMetzinger Offline
top fuel
WadeMetzinger  Offline
top fuel

Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
Jim, I had a lot a clearance on both motors.

The Drag week motor had over .200 from 15 before to 15 after, so I didn't write anything down just put down plenty.

On my 4.360 motor had .118 at 10 ATDC on Intake, closest was 115 @ 13 ATDC and for exhaust it had .160 at 10 BTDC and the closest was .150 at 12 BTDC.

I also had .052 Piston to Head clearance (.025 in the hole and .027 head gasket)

Re: Your Piston Specs - B1 head valve reliefs [Re: 440Jim] #2893638
02/27/21 11:02 AM
02/27/21 11:02 AM
Joined: Aug 2003
Posts: 1,313
Charlotte, NC
L
LSP Offline
pro stock
LSP  Offline
pro stock
L

Joined: Aug 2003
Posts: 1,313
Charlotte, NC
Originally Posted by 440Jim
I am planning 0.043" top and second rings; comments on 3/16 or 3mm oil ring?


The 3mm oil ring is more than enough, will meter oil better than the 3/16" oil ring will, and the extra .070" skirt length will add to piston stability.

Re: Your Piston Specs - B1 head valve reliefs [Re: WadeMetzinger] #2893892
02/27/21 09:24 PM
02/27/21 09:24 PM
Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
WadeMetzinger Offline
top fuel
WadeMetzinger  Offline
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Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
Jim, I messed up. Those p-to-V numbers were test fitting, no head gasket and before I milled the heads .040.

Here is a pic of the actual P-to-V measurements.

E78309AF-16B4-4960-95F0-1957396DD10E.jpeg

Wade Metzinger 918-809-0987
71 Cuda 9.28@145 -1s, Pglide
68 Cuda 10.64@124 1.45 60's 318->390 eddys
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Re: Your Piston Specs - B1 head valve reliefs [Re: WadeMetzinger] #2893903
02/27/21 09:50 PM
02/27/21 09:50 PM
Joined: Jan 2003
Posts: 16,923
NC
440Jim Offline OP
I Live Here
440Jim  Offline OP
I Live Here

Joined: Jan 2003
Posts: 16,923
NC
Thanks Wade,
That 0.013" change in gasket and milling doesn't change the impression I had.
But I appreciate the attention to detail.

I need to figure out how that cam had about the right P2V with the deep valve reliefs. 0.372 / 0.312
The slightly narrow LSA (110) might cause some of that. Compared to the nitrous cam with 115 LSA.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
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