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-   -   A Loss Of 1300 Rpm? (https://www.offshoreonly.com/forums/general-boating-discussion/231910-loss-1300-rpm.html)

h2ohotrodder 06-03-2010 02:53 PM
A Loss Of 1300 Rpm?
 
Where did it go? I had a 540 Big Chevy in my Sonic 3yrs ago & it ran up to 4900/5000 rpm.I blew a head gasket from a cracked riser & it sat in my garage for 3 yrs & I ran a little 454 for a great 3yrs! Now the motor is back together with a different cam but very similar to the last one & a single plain intake instead of the dual plain & now the motor will only go to 3700 rpm? The prop.carb,heads & exhaust are all the same! Could it really be the intake?Hard to believe!

JCPERF 06-03-2010 05:11 PM
Originally Posted by h2ohotrodder (Post 3126426)
Where did it go? I had a 540 Big Chevy in my Sonic 3yrs ago & it ran up to 4900/5000 rpm.I blew a head gasket from a cracked riser & it sat in my garage for 3 yrs & I ran a little 454 for a great 3yrs! Now the motor is back together with a different cam but very similar to the last one & a single plain intake instead of the dual plain & now the motor will only go to 3700 rpm? The prop.carb,heads & exhaust are all the same! Could it really be the intake?Hard to believe!
Cam could be in wrong

I DIG IT !! 06-03-2010 06:56 PM
X2 I bet the cam is off one tooth.

CB-BLR 06-03-2010 09:00 PM
Originally Posted by JCPERF (Post 3126547)
Cam could be in wrong
x3

or you have plug wires crossed

Chris


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