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View Full Version : OMC Tech V 8 questions/ Can anyone help


TomAprilsswitzers
05-26-2014, 10:40 PM
Does anyone know what the max PSI for a blue printed V8 should be? Before we blue printed and evened out the ports on it the PSI was 135, this is an original 3.6 punched out to 4.0 liters. We now have 150-152 psi after raising the ports and the motor has not been broke in yet , only about 30 minutes at the dock, and this is with stock 4 liter heads, I have a pair of Taylor Marine and Machine heads and I am afraid to put the on with the PSI at this level? anyone? I have been told that the max PSI should be 145 to 155, but I have also been told that stock V6's are usually 150...HELP!!!!:D:eek::confused:
apache 41
05-27-2014, 07:23 PM
I'm looking for some one to do some motor work on my V8.. who did yours ??
BUZZIN' DOZEN
05-27-2014, 07:37 PM
Fwiw, my old 2nd Effort V8 had a 150+ comp and I never ran anything other than pump gas


http://i27.photobucket.com/albums/c165/O-SIZE/scan0009.jpg
Instigator
05-28-2014, 03:43 AM
A stock, carbed V-6 looper has about 100 - 110 PSI and a 225 HO/250 about 115 - 125 cranking compression.
The 8's varied a bit from yr to yr abut I think 130 - 135 was the high side.

Careful getting too geeked about compression prior to break in. I've had numbers all over the board on new rebuilds.
High #'s, low #'s, variance from hole to hole but once broke in they'd be where they were supposed to.
Mr. Action
05-28-2014, 12:27 PM
Both my v8s are around 155 pump gas no issues recently went black n wanna sell all my v8 stuff Gary call me we can work somthin out
3057769687
STV_Keith
05-28-2014, 12:28 PM
I'm looking for some one to do some motor work on my V8.. who did yours ??

Gordon at Monty Racing did mine. VERY satisfied after 6 seasons...still going strong.
ar300johnson
05-29-2014, 06:04 AM
+1 on Gordon at Monty racing. Probably the best V-8 man anywhere. The motors idle like stock but run like a striped ape. He's very reasonable for his work too.
kimswang
06-11-2014, 01:47 AM
Monty is finishing my third one right now.
rockman69
06-11-2014, 12:31 PM
Gordon at Monty Racing did mine. VERY satisfied after 6 seasons...still going strong.

Boy I like the sound of that!
rockman69
06-11-2014, 02:46 PM
Careful getting too geeked about compression prior to break in. I've had numbers all over the board on new rebuilds.
High #'s, low #'s, variance from hole to hole but once broke in they'd be where they were supposed to.

Glad to hear, I did a comp check on the current motor and had 3 at 125, 4 at 127 and 1 at 115. Thought maybe I forgot to ring that one!