[DavidS]

A few months ago I bought a rebuilt gen IV 427 on EBay for my 69 Camaro and had nothing but problems with it. Low oil pressure (5-10 psi) and high temperatures (210-220 degrees F).

I brought it to Precision Automotive in Simsbury, CT to be checked and was told:

Bores
4.313 - 4.3135
Pistons
4.307 = 0.0065 CL
Ring Gap
0.027 to 0.028
Crank Mains
2.7385 0.10 under
Main Housing Bore
+0.005 0.006 CL Bearing
Rods
2.1895 0.010 0.0015 CL
Cam is Comp Cams 294S (# 11-219-4)
0.022 Lash
595 248 110 degrees
595 248 (not same as book)

Spring
1.88/1280
1.45/380


he also said:
- it was originally a 2 bolt converted to a 4 bolt
- the mains are way over (6 thou clearance)
- the rods are a little tight
- the bearings are history
- he will hone and ring it

so they rebuilt it and put it on the dyno today.

Dyno setup:


Running:


went to 505 hp