455 Re-fresh

My 70 GS455 had a persistent front cover leak and some performance issues, so off it went to Ivyland collision for some TLC. After speaking with Nick Serwo and going over some options, out goes the 455 for a much needed refresh. I had a fresh pair of Gessler stage 1 iron heads and ported intake waiting in the wings. Nick is taking care of the bottom end as we speak. Looking for some much needed reliable and upgraded power, let's see what the new combo will bring!

 

Nick will treat it right with much love

 

Looks good

 

Maybe you can have it ready for Cecil in 2 weeks to break it in.

 

Some more pics

 

So, it's going to be a ported 70 S1 iron head motor. Any guesses on where this will land on the dyno spectrum? A couple more build pics....

 

Mild cam with manifolds 440
Aggressive cam with manifolds 460
Both on pump 93 headers would add 20ish

 

Nick sent me over a few more pics....coming together nicely!

 

Getting closer!!! Engine is fully assembled and waiting for dyno time.....

 

Anxiously waiting

 

Moving quickly

 

What did final compression come in at 9.5?

 

Looking good! Ahh man this is making me want to get back going on my 70 455 build. Unfortunately I had to put it on pause to rebuild my TH400 so I could enjoy the car this season and that ate up my engine fund so back to saving I go.

 

That sucks, rebuilding a transmission isn't as exciting as an engine

 

I told Lee I would post the specs


Bore 4.350
Deck 10.563
Gasket felpro Performance .041 4.380 dia
23 cc Wiseco pistons on Molnar rods
Cast rings
Compression is 9.63
Heads are 68 CC
1070 455 block Drilled oil passages , all hard truns radiused for flow & stepped front galley oil plugs
Ta cover with new gears deburred & wear plate port matched for flow v6 filter housing set end clearance on pump.
Rollmaster timing chain cam degreed set +8 adv arp bolts
Groved cam bearings
Modified pick up tube with AMP screen
Oil pan is a 6 quart replacement with AMP Baffle welded in rear
Heads are Gregs Gesslers level 3 Int .600 274cfm / Exh .600 200cfm 2.130 Intake 1.75 Exh /120 seat on springs /280 open
Cam is Comp 230/240 .506/.525 on 112 cl installed @ 108
Lifters are delfi GM
Manley pushrods custom length
Stamped Steel 1970 rockers
Intake is stock 1970 style ported By Greg & divider cut
Main Bearings clearance set @ #1&2 .0028 /00025/ .003/ #3&4 /.003 #5
Molnar Rod bearings .0023-.0025
1970 Qjet 704040 & 1971 800 to test
A set of ported 1970 Manifolds

 

I like everything except the rings

 

Street engine .

 

A couple more pics of the oil pan and pick-up mods.

 

Interested to see what it makes, ...I'm thinking tq will be strong

 

Had to go +8 to get to 108, I had to due the same thing with my 308s. Though I had something wrong, clearly there are other combos that need the same