Modified L31 with a Proflow 4 system

[tayto]

been waiting to hear your opinion on the Holley exhaust manifolds. i like the heat shields on the exhaust manifolds, looks good!

[TriumphR3]

I like those heat shields too. Did they come with the manifolds or are they custom?

[Fast355]

I like those heat shields too. Did they come with the manifolds or are they custom?

They are L31 350 manifold shields. Still available new from GM for about $5 ea. The dipstick and tube are also for a L31 truck or Tahoe. I looked up many of the part numbers on Nemiga parts.

The one thing I have not been able to find yet is a G-van 454 air duct. The 454 air cleaner and duct has an air inlet that is 2x the size of a stock small block.

[Fast355]

been waiting to hear your opinion on the Holley exhaust manifolds. i like the heat shields on the exhaust manifolds, looks good!

I know they will be down a bit on HP and substantially on torque to headers, but they fit very nicely and I can easily get my hand into the space left over to access the spark plugs and wires. I can get to all the plugs with a standard spark plug socket and 3/8" flex head ratchet.

[Fast355]

Just thought I would add it does run fully on its own fuel system now, TBI tank &sending unit with a vortec pump.. It literally started very quickly and easily considering the timing was a bit retarded and nothing has been messed with on startup fuel. I ran the engine independent of the vans harness, save for the fuel pump relay and fuel pump wiring I had already connected to the Proflows fuel pump output in the process of getting the wiring sparted.

1st start
https://youtube.com/shorts/pN8rTQVkP...uKOreS6DbHoHLx

1st warmup, base timing adjusted to the specified 12 btdc with the set timing mode enabled
https://youtube.com/shorts/RCqewqzyY...CnS_HpZFLTcJG9

Warmed up, Idle air flow screw adjusted.
https://youtube.com/shorts/q6WOUPrYw...pXAcUwvlrc1Uu6

[Fast355]

https://youtube.com/shorts/pJWi1-9nj...CuuTd-YbIcK6MR

[Fast355]

Pulled it out of the shop and made a brief test drive. Running well enough already that it stalls the OE TH400 converter ~2,500 rpm and hazes the right rear P275/60R15 even with the 3.08 gear lol.

[Kitch]

Hi Fast,

Always interested in your progress on this.
Whats up with the 12.3V battery voltage on the dashboard display, isn't that a bit low?

Cheers,
Andrew

[Fast355]

Hi Fast,

Always interested in your progress on this.
Whats up with the 12.3V battery voltage on the dashboard display, isn't that a bit low?

Cheers,
Andrew

I need to replace the alternator and finish wiring it up.

[Fast355]

Hi Fast,

Always interested in your progress on this.
Whats up with the 12.3V battery voltage on the dashboard display, isn't that a bit low?

Cheers,
Andrew

Put a 145 amp AD244 on it and wired it up. Charges perfectly now. 14.5 on a cold start and settles down around 13.8-14.0 when it is hot.